FlutterBlue aims to offer the most from both platforms (iOS and Android).

Using the FlutterBlue instance, you can scan for and connect to nearby devices (BluetoothDevice).
Once connected to a device, the BluetoothDevice object can discover services (BluetoothService), characteristics (BluetoothCharacteristic), and descriptors (BluetoothDescriptor).
The BluetoothDevice object is then used to directly interact with characteristics and descriptors.

Breaking change. Upgraded to Gradle 4.1 and Android Studio Gradle plugin
3.0.1. Older Flutter projects need to upgrade their Gradle setup as well in
order to use this version of the plugin. Instructions can be found
here.